John Gills Exposition of the Bible Commentary - 1 Samuel 17:3
And the Philistines stood on a mountain on the one side, and Israel stood on a mountain on the other side , Before the Israelites are said to encamp in or by the valley; but here they are said to take the higher ground, and face the Philistines, who were on a mountain or hill on the other side over against them, which Kimchi reconciles thus; the whole or the grand army lay encamped in the valley, and, they that were set in array, or the first ranks, the first battalion, ascended the mountain... read more
Matthew Henry's Complete Commentary - 1 Samuel 17:1-11
It was not long ago that the Philistines were soundly beaten, and put to the worse, before Israel, and they would have been totally routed if Saul's rashness had not prevented; but here we have them making head again. Observe, I. How they defied Israel with their armies, 1 Sam. 17:1. They made a descent upon the Israelites? country, and possessed themselves, as it should seem, of some part of it, for they encamped in a place which belonged to Judah. Israel's ground would never have been... read more